How severe is CVE-2025-52952?

CVE-2025-52952 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-52952 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-52952?

CVE-2025-52952 primarily affects Juniper Junos. In total, 13 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-52952?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-52952 have an EU (EUVD) identifier?

Yes. CVE-2025-52952 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-21157.

When was CVE-2025-52952 published?

CVE-2025-52952 was published on 2025-07-11 and last updated on 2026-06-17.

CVE-2025-52952

CVE-2025-52952 is a medium-severity vulnerability in Juniper Junos with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 7.1
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-21157
Weakness: CWE-787
Affected product: Juniper Junos
Published: 2025-07-11
Last modified: 2026-06-17

Description

An Out-of-bounds Write vulnerability in the connectivity fault management (CFM) daemon of Juniper Networks Junos OS on MX Series with MPC-BUILTIN, MPC1 through MPC9 line cards allows an unauthenticated adjacent attacker to send a malformed packet to the device, leading to an FPC crash and restart, resulting in a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue affects Juniper Networks: Junos OS: * All versions before 22.2R3-S1, * from 22.4 before 22.4R2. This feature is not enabled by default.

Frequently asked questions

What is CVE-2025-52952?: An Out-of-bounds Write vulnerability in the connectivity fault management (CFM) daemon of Juniper Networks Junos OS on MX Series with MPC-BUILTIN, MPC1 through MPC9 line cards allows an unauthenticated adjacent attacker to send a malformed packet to the device, leading to an FPC crash and restart, resulting in a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue affects Juniper Networks: Junos OS: * All versions before 22.2R3-S1, * from 22.4 before 22.4R2. This feature is not enabled by default.
How severe is CVE-2025-52952?: CVE-2025-52952 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-52952 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-52952?: CVE-2025-52952 primarily affects Juniper Junos. In total, 13 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-52952?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-52952 have an EU (EUVD) identifier?: Yes. CVE-2025-52952 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-21157.
When was CVE-2025-52952 published?: CVE-2025-52952 was published on 2025-07-11 and last updated on 2026-06-17.

References

Affected products (13)

cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:22.2:-:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:22.2:r1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:22.2:r1-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:22.2:r1-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:22.2:r2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:22.2:r2-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:22.2:r2-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:22.2:r3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:22.4:-:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:22.4:r1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:22.4:r1-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:22.4:r1-s2:*:*:*:*:*:*

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